Initially somewhat peaky, everyone I included in cast was indecisive (14)

'was indecisive' is the definition.
(to shillyshally is to be indecisive or dithering)

'initially somewhat peaky everyone i included in cast' is the wordplay.
I cannot quite understand how this works, but
'peaky' could be 'hilly' (having lots of hills or peaks) and 'hilly' is present in the answer.
'everyone' could be 'all' (all people) and 'all' is present in the answer.
'i' is within the answer.
'cast' could be 'shed' (shedding is a kind of casting) and 'shed' is found in the remaining letters.
A single letter 's' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).